UK Day Rate to Salary Calculator

How to Convert a Day Rate to an Equivalent Salary

Comparing a contractor day rate to a permanent salary is not as simple as multiplying the day rate by the number of working days in a year. A permanent employee receives benefits that a contractor must fund themselves, including employer National Insurance contributions, workplace pension contributions, paid holidays, sick pay, and various other benefits. When a company hires a permanent employee, the true cost to the employer is significantly higher than the gross salary alone. Conversely, when a contractor quotes a day rate, that rate must cover periods of unpaid leave, pension contributions, insurance, training, and the administrative overhead of running a business. This calculator bridges the gap by adjusting for these factors to produce a meaningful comparison.

The starting point is the gross contractor income, calculated by multiplying the day rate by the total number of available working days in the year (typically 220 days, which accounts for weekends but not holidays or sick days). From this, we subtract the holiday days that a permanent employee would receive as paid leave. The UK statutory minimum is 28 days (including bank holidays) for a full-time worker, though many employers offer more. This gives the actual working days and the actual annual income. To find the equivalent permanent salary, we then divide this figure by the employer overhead factor, which includes employer National Insurance at 13.8 percent and auto-enrolment pension contributions, typically at least 3 percent. The result is the gross annual salary that would cost the employer the same amount as the contractor day rate.

Why Contractors Charge Higher Day Rates

It is common for people to see a contractor earning 500 pounds per day and assume they earn far more than a permanent employee on 60,000 pounds per year. However, the reality is more nuanced. Contractors do not receive paid holidays, so they lose income for every day they take off. They do not receive employer pension contributions, so they must fund their own retirement savings. They pay for their own professional indemnity insurance, accounting services, equipment, and training. They bear the risk of gaps between contracts when they earn nothing at all. Additionally, contractors operating through limited companies face corporation tax on profits, and those affected by IR35 legislation may face an even higher effective tax burden. When all of these factors are considered, a contractor charging 500 pounds per day may have an equivalent permanent salary of only 55,000 to 70,000 pounds, depending on their working pattern and overheads.

Understanding Employer Costs in the UK

Employer National Insurance contributions are a significant additional cost of permanent employment. As of 2026, employers pay 13.8 percent on employee earnings above the secondary threshold. This means an employee earning 50,000 pounds costs the employer approximately 6,300 pounds in NI alone, before any other benefits. Workplace pension auto-enrolment requires employers to contribute at least 3 percent of qualifying earnings, adding another 1,200 to 1,500 pounds per year for a typical salary. Many employers contribute more than the minimum, with 5 to 8 percent being common in competitive industries. When you add apprenticeship levy contributions (0.5 percent for large employers), statutory sick pay obligations, maternity and paternity pay, and other employment costs, the total employer overhead can reach 20 to 25 percent above the gross salary. This is why the equivalent salary figure from this calculator is always significantly lower than the raw day rate multiplied by working days.

Example Calculation